The Decagon House Murders by Yukito Ayatsuji

Firstly, huge thanks to Pushkin Vertigo and NetGalley for providing me with a copy of this novel in exchange for an honest review. 

Publisher: Pushkin Vertigo
Publication Date:
Length: 234 pages
Translated Fiction | Japanese Fiction | Mystery | Thriller

CW: n/a

The members of a university mystery club decide to visit an island which was the site of a grisly, unsolved multiple murder the year before. They’re looking forward to investigating the crime, putting their passion for solving mysteries to practical use, but before long there is a fresh murder, and soon the club-members realise they are being picked off one-by-one. The remaining amateur sleuths will have to use all of their murder-mystery expertise to find the killer before they end up dead too.



The first thing that struck me about this novel was how self aware it was. After the initial prologue where the reader is let in on the sinister story behind the trip for the students, we’re launched into the students travelling to the island where they are discussing mystery fiction. I liked this unusual opening and it felt fresh for detective fiction – even if the novel was first published in the 80s. This opening was a great way to introduce each of the characters and establish the fact that they feel equipped to be detectives. Although they are university students, it didn’t feel out of place at all for them to be the ‘detectives’ as it were. Ayatsuji does a brilliant job at making this feel very believable. 

I really liked all of the characters in the novel, I also loved how they all referred to themselves by their nicknames, all taken from great detective fiction writers. I think Ellery was probably my favourite and I found that a lot of my theories regarding what was going on on the island (as well as what happened six months ago) lined up with his. The dynamic of the group was very well done, I have always wondered what would happen with multiple detectives all working on a case and I think that this did a great job of sort of doing this. Through this group Ayatsuji brilliantly captures very genuine relationships, that just because these students all share the same interest and are in a club together this doesn’t necessarily mean that they are all the best of friends. 

The narrative shifts between the events that are occurring on the island as well as what is happening on the mainland with former members of the club. This switch back and forth did an excellent job of sustaining the suspense and kept me hooked. Changing the narrative like this really highlighted how calculated and well planned this entire scheme was. Not only this but, through regularly seeing things that the students didn’t the reader could form even more ideas of what they thought was going on and who was responsible. I went through many different theories and, despite being a chronic overthinker myself, I still didn’t see the end coming and gasped when I came to the end of the book. 

It’s always difficult to review detective fiction as there’s just so much I would love to say on how the plot was developed and how things unfolded, especially with the epilogue, however that would spoil what is a truly wonderful book! If you’re a mystery fan or a Japanese fiction fan, this is a must read! Even if you don’t fall into either category this is still one you should seriously consider picking up but be warned – when you do you’ll find it very difficult to put it back down!

Rating: 5 out of 5.

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